Python 3.12 cannot import local python files as modules

[snippsat]

This problem of not understanding how sys.path work can arise on all OS Windows,Linux,Mac.
This problem has been asked here or other places many times for all OS.
From Python Doc The initialization of the sys.path module search path

If want to add some folders permanently it only takes a minute,using PYTHONPATH.

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Other ways eg poetry it will make a package automatic with pyproject.toml and test folder.
This way will be easier if eg one day want to add package to PyPi,then just poetry publish.
Can just ad poetry later if have make a package and it's more serious project like want it on PyPi.

G:\
λ poetry new my_package
Created package my_package in my_package

G:\
λ cd my_package\

G:\my_package
λ ls
my_package/  pyproject.toml  README.md  tests/

G:\my_package\my_package
λ ls
__init__.py  __pycache__/  foo/  main.py

Use it two way.

G:\my_package
λ poetry run python
Python 3.12.2 (tags/v3.12.2:6abddd9, Feb  6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from my_package import bar, main
>>>
>>> bar.answer_to_life()
42
>>> main.main_func()
'Now in main func'
>>> exit()

Or poetry will create a virtual environment automatic with poetry shell.

G:\my_package
λ poetry shell
Creating virtualenv my-package-Jw3aWtBz-py3.12 in C:\Users\Tom\AppData\Local\pypoetry\Cache\virtualenvs
Spawning shell within C:\Users\Tom\AppData\Local\pypoetry\Cache\virtualenvs\my-package-Jw3aWtBz-py3.12

(my-package-py3.12) G:\my_package>python
Python 3.12.2 (tags/v3.12.2:6abddd9, Feb  6 2024, 21:26:36) [MSC v.1937 64 bit (AMD64)] on win32
Type "help", "copyright", "credits" or "license" for more information.
>>> from my_package import bar, main
>>>
>>> bar.answer_to_life()
42
>>> main.main_func()
'Now in main func'
>>> exit()